<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>全局污染</title>
</head>
<body>
    <script src="002.js"></script>
    <script>
        // 不加严格模式，打印的是 大美女，不会是 xiasnn
        // 加了严格模式，会提示没有定义
        "use strict";
        web = 'xiasnn';

        show();

        console.log(web);
    </script>
</body>
</html>